the world now knows the answer is jason wu. again. this response from wu on twitter, #inshock, shows he was just surprised this time as he was four years ago. take me to the moment where she walked out. >> i was screaming at the top of my lungs, that's me! >> it's really brilliant what she's done in keeping a secret. in previous administrations, while there was always interest in what the first lady wore, there was never this read carpet moment. >> reporter: red was definitely on her mind. an exclusive look at jason wu's sketch of the obama gown, and clearly there was something here that caught the first lady's eye. in choosing wu, she once again puts the taiwanese born designer, who lives in new york, on the biggest world stage. not to be forgotten, another outfit on display. the one the first lady wore on inauguration morning. her choice this time? coat and dress by american designer thom browne. we tracked him down at his hotel in paris. celebrating the moment. >> you can never predict life to happen this way, and i'm so fortunate,